Supergirl or Kara Zor-El is Superman's cousin and shares the same superpowers and vulnerability to Kryptonite as he does.
She first graced DC Comics in 1958 and is the female counterpart to Superman.
Known more recently from the TV series of the same name from 2015.

Superwoman has a few incarnations, the first being Lois Lane in 1943, as she dreams she has gained superpowers from Superman after a blood transfusion and begins her career as Superwoman.
The second version is from 1964 and is an evil counterpart of Wonder Woman. She is a supervillain from the Justice League of America.